Other
Clermont College: Genetic Practice Problems
Clermont College provides a good interactive practice test using Punnett squares.
University of Maryland
Univ. Of Maryland Baltimore Cty/biology Century
Historical perspective on Mendel's contribution. Spends a little time setting up what the current beliefs of Mendel's day were and how he changed things with what he did.
University of Arizona
University of Arizona: Dihybrid Problem Set
This site is provided by the University of Arizona and it gives great information on the subject. Good collection of dihybrid crosses which exemplify the issue of independent assortment. Work these once you think you've mastered th concept.
Open Curriculum
Open Curriculum: Mendelian Inheritance
Students use this article to identify how probability is used to predict outcomes of genetic crosses.